不同5xxx系焊丝对5182-H111组织和性能的影响

使用3种焊丝ER 5183、ER 5356、ER 5554对6mm 5182-H111铝合金板材进行半自动MIG焊对接试验,通过对焊接接头进行力学性能试验、显微硬度测试及金相组织的观察,探究3种焊丝对5182-H111铝合金组织和性能的影响。结果表明,使用3种焊丝所焊接头中,ER 5183及ER 5356接头抗拉强度均大于ISO 15614-22005要求的焊缝接头系数(1.0),而ER 5554接头焊缝系数仅为0.949;3种焊丝所焊接头硬度均在焊缝区及热影响区有所降低,其中ER 5356所焊接头焊缝强度较其他两种焊丝焊缝区硬度高,为85.5HV;3种焊丝所焊接头组织形貌相近,均存在β(Mg2Al3)强化相,但由于ER 5183与ER 5356焊丝中含有更多的Mg,因此生成了更多的β(Mg2Al3)相,使得焊缝组织更加致密。

Effect of Different 5xxx Welding Wires on Microstructure and Properties of 5182-H111

In this paper,ER 5183,ER 5356 and ER 5554 are used to conduct semi-automatic MIG welding butt test on 6mm 5182-h111 aluminum alloy plate.Based on the mechanical property test,micro hardness test and metallographic observation of the welded joint,the influence of three kinds of welding wires on the microstructure and properties of 5182-h111 aluminum alloy is investigated.The results show that the tensile strength of ER 5183 and ER 5356 joints in the welding joint coefficient(1.0)required by ISO 15614-22005,while the welding joint coefficient of ER 5554 is only 0.949.The hardness of the welding joints of the three kinds of welding wires decreased in the weld zone and the heat-affected zone,and the strength of the welding joints of ER 5356 is higher than that of the other two kinds of welding wires,which is 85.5HV.The microstructures of the welded heads of the three kinds of welding wires are similar,and there is β(Mg2Al3)strengthening phase in all of them.However,since the ER 5183 and ER 5356 wires contain more Mg,and more β(Mg2Al3)phases are generated,the weld microstructure becomes denser.